Core barrel and rotary bit



Febo 23 9 W260 W. L. FOSTER CORE BARREL AND ROTARY BIT Filed Nov. 5, 1924 2 Sheets-Sheet 1 INVENTOR. Wa/ier A. 55/57" BY 7 Milk 5 ATTORNEYS.

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CORE BARREL AND ROTARY BIT A TTORNEYS.

Patented Feb. 23,. 1926,

o srars PATENT OFFEE.

WALTER L. FOSTER, O}? WEITTIER, CALIFORNIA, ASSIGNOR 0F ONE-FOURTH T0 WIL- LIAM MEREDITH, 0F HUNTINGTON BEACH, AND ONE-FOURTH T0 W. H. TAYLOR,

OF SOUTH PASADENA, CALIFORNIA.

CORE BARREL AND ROTARY BIT.

Application filed November 3, 1924;. Serial No. 747,554.

To all whom it may concern.

Be it known that I, WALTER L. FOSTER, a citizen of the United States, and resident of Whittier, in the county of Los Angeles, State of California, have invented new and usefullmprovements in a Core Barrel and Rotary Bit, of which the following is a specification.

This invention relates to a rotary boring tool and core barrel. Tools have been constructed of this general character but the speed with which hole may'be made with tools heretofore used have not been suf ficiently greatto be satisfactory.

The rimary'object of this invention is to provide a tool of the character described which will make hole rapidly. Another object of this invention is to provide a tool of the character described having rotary disks as cutters which are arranged to leave a central core together with means for retainin the core in the tool. A. further object 0 this invention is to provide a tool of the character described which has means for delivery of circulation fluid at the point of cutting, wherebythe cuttings and detritus are. carried away. In addition to the broader objects of this invention, there are certain details of construction, whereby an economical, efficient, and durable, structure is ob tained These objects together with other objects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing, in which: 1

Fig. 1 is an elevation of a. complete tool with the upper portion thereof shown in section; Fig. 2 is an enlarged view showing the drill head in vertical section as seen on the line 22 of Fig. 1; Fig. 3 is a bottom view as seen on the line 33 of Fig. 2; Fig. 4.- is a section as seen on the line 44 of Fig. 2; Fig. 5 is a vertical section through a head employing rotary cutter to trim the core; Fig. 6 is a bottom view as seen looking in the direction of the arrows 6-6 of Fig. 5; Fig. 7 is a section as seen on the line 77 of Fig. 5; and Fig. 8 is a section as seen on the line 88 of Fig. 5.

Referring more particularly to Figs. 1 to 4, inclusive, 10 indicates the usual drill pipe serving to rotate the tool and acting as a conduit for the supply of circulation fluid to the cutters. Mounted upon the lower end of the drill-pipe, is an adapter 11 having ataperedlpin 12 at the lower end. Mounted upon the adapter is a tubular shank 14: enlarged in diameter at the lower end. Extending. from the shank are ears 15 spaced from a tubular extension 16 to provifieslots for mounting of the cutting disks. Teeth are formed on the lower edge of the tubular extension to assist in cutting the sample core. Rotatably mounted between the ears and tubular extension are rotary cutting disks 17 of the usual type. The axes of the cutting disks are non-radial to the head so that in rotating the head the disks scrape the hole and thereby perform their cutting action. The bore of the head .is enlarged and threaded so as to receive disks wear insure cutting of the hole to the proper diameter.

The retainer tube 18 is of such diameter as to provide a space between its wall and the drill pipe head so that circulation fluid may pass downwardly and through the passages 20 to the cutters. Within the retainer tube is a split core sleeve 22 which rests therein. This core tube has tongues 23 upset therefrom to engage the core as it enters and hold the same. As the core is cut and enters the sleeve and retainer tube, liquid and air may be entrapped above the core. To permit the escape of the liquid, I have provided a port 24 closed by a valve 25. This valve permits fluid to escape from the retainer tube but prevents entrance of the circulation fluid into the tube.

It is obvious that the construction is such as to rapidly make hole by reason of the disks. These disks are so disposed as to leave an upstanding core which is trimmed by the tubular cutting extension 16, thereafter enteringthe tube and bein captured. The parts are such that the drill may be easily disassembled to permit withdrawal of the core.

Referring more particularly to Figs. 5 to 8, inclusive, the modified form of structure shown comprises an adapter 26 and a tubular shank 27. Depending from the outside of the shank are two ears 28 provided with laterally extending reaming teeth 29. There is a tubular extension 30 and mounted between the cars 28 and the extension are disk cutters 31 which make hole. The head is provided with passages for circulation fluid. Extension 30 has .disks 32 mounted at an angle so as to trim the core to such a size that it will readily enter the core opening. Whereas the cutter disks 31 are non-radial, the trimming disks 32 are radial. The purpose of the trimming disks is not to make hole but merely to prepare the core as it is being out. It will be noted that the circulation fluid is supplied to the upper edge of the trimming disks so as to wash the latter clean.

What I claim is:

1. In a tool of the class described, the com bination of a head having a tubular extension forming the mouth of a core barrel, a plurality of rotary disk cutters mounted about said extension on axes non-radial to the longitudinal center of said head. lateral reaming teeth extending from said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disk, and core trimming cutters on said extension.

2. In a tool of the class described, the combination of a head having a tubular extension forming the mouth of a core barrel, ears over-hanging said extension, a plurality of rotary disk cutters journalled between said extension and said ears on axes nonradial to the longitudinal center of said head, lateral reaming teeth extending from said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disk, and core trimruing cutters on said extension.

3. In a tool of the class described, the combination of a head having a tubular extension forming a mouth of a core barrel, :1 plurality of rotary disk cutters mounted about said extension on axes non-radial to the longitudinal center of said headfsaid head having passages for circulation fluid extendin therethrough and opening adjacent said disks, andtrimming cutter disks mounted on axes radial to the longitudinal axis of said head.

4. In a tool of the class described, the combination of a head having a tubular extension forming the mouth of a core barrel, ears over-hanging said extension, a plurality of rotary disk cutters journalled between said extension and said ears on axes nonradial to the longitudinal center of said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disks, and trimming cutter disks mounted on axes radial to the longitudinal axis of said head.

5. In a tool of the character described, the combination of a head having a tubular extension forming the mouth of a core barrel, a plurality of rotary disk cutters mounted upon said extension on axes non-radial to the longitudinal axis of said head, lateral reaming teeth extending from said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disks, and trimming cutter disks mounted on axes radial to the longitudinal axis of said head.

6. In a tool of the class described, the combination of a head having a tubular extension forming the mouth of a core barrel, ears over-hanging said extension, a plurality of rotary dlsk cutters journalled between said extension and said ears on axes non-radial to the longitudinal center of said head, lateral reaming teeth extending from said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disks, and trimming cutter disks mounted on axes radial to the longitudinal axis of said head.

7. In a tool of the class described, the combination of a head having a tubular extension forming the mouth of a core barrel, a plurality of rotary disk cutters mounted about said extension on axes non-radial to the longitudinal center of said head, said head having passages for circulation fluid extending therethrough and opening adjacent the disks, and trimming cutter disks mounted on axes radial to the longitudinal axis of said head with their planes inclined so that their cutting edges register with the mouth of said barrel.

8. In a tool of the class described, the combination of a head having a tubular exten sion forming the mouth of a core barrel, ears overhanging said extension, a plurality of rotary disk cutters journalled between said extension and said ears on axes non-radial to the longitudinal center of said head, said head having passages for circulation fluid extending therethrough and opening adjacent said disks, and trimming cutter disks mounted on axes radial to the longitudinal center of said head with their cutting planes inclin ed'so that their cutting edges register with the opening in said core barrel. a

In witnessthat I claim the foregoing I have hereunto subscribed my name this 6th day of October, 1924.

. WALTER L. FOSTER. 

